<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 200px;   
            height: 200px;
            background-color: #f00;
            padding: 50px 10px;
            border: 5px solid green;
            margin: 50px 10px;

        }
    </style>
</head>
<body>
    <div>我是一个容器元素的内容</div>
    <p>我是一个普通元素的内容</p>
</body>
</html>